Electric heating-iron.



H. VANDERPOOL.

ELECTRIC HEATING IRON. urnlouxon Hum 11.13.19. mo,

Patented' Jan. 10, l1911.`

2 sn'nn'rswmm 1.

H. vANDBRPooI..

ELECTRIC HEATING IRON. APPLIUATIOI FILED IAB, 19. 1910.

Panama Jan. 1o,A 1911.

BHEBTB-BHEBT 2.

' showing the mi va'NDE'arooL, or TURTLE' CREEK, PENNSYLVANIA, AssI'eNoR 'ro BRA'nDocx QBNAMENTAL InoN Ann4 wma MTION 0F PENNSYLVANIA.

wenns, or BRADDoCx, PENNSYLVANIA, A Conro- ELECTBIC HEATING-IRON.

Specification ot Letters Patent.

' Patented Jan. 10, 1911.

` Application led March 19, 1910. Serial No. 550,464.

To all whom if may concemf Be it known that I, HARRY VANDERPooL, a citizen of the United States, residing at Turtle Creek, in the county of -Allegheny and State of 'PennSyl-Vania, have invented certain new and useful Im rovements in Electric Heating-Irons, of which the following is a specifica-tion, reference being had therein to the accompanying drawing.

My invention relates to improvements in electric sad irons and has for its object to provide a sadiron in which a variable resistance and the resulting variable heat is secured by means of a separable resistance unit. Also by means of varying the resistance and resulting heat in such a unit by changing the current therethrough by distribution of the current through' separably operable contact mechanism.

The invention also relates to the combination' with the sad iron of variable weights and means for retaining them in position, together with other features of construction and iml rovement as shall be more` fully hereina ter described.

I'n the drawings :'-F-igure 1 represents the sad iron in side eleva-tion.' Fig. 2 is a central vertical sectional view through thefbody of the iron. Fig. 3 is a horizontal sectional View indicated by the broken line III. Hl. of Fig. 2. Fi 4 is a rear end view ot the sad' iron showing the contact mechanism in section on the line IV. IV. of Fig'. 2. Fig. 5 is a transverse sectional view on the line V. V.l of Fig. 2. tional view on the line VI. VI. of Fig. 2, shifting contacts. Fig. 7 is a similar sectional view showing a modified construction. Fig. 8 is a detail view similar to the contact mechanism of Fig. 2, showing one ofthe contacts out of engagement.

2 represents the body of he iron of the usual or suitable form customary in sad irons, having' an integral bottom, sides and top and a hollow interior 3. The iron is entirely open at its rear end, with the' exception of inwardly extending lugs 4 for the urpose of securing the rear 'wallA of the unit in position as hereinafter de- Scrl z Fig. 6 is a horizontal sec- Q 'Ifhe heating or resistance -'unit comprises in its entirety, in the preferred/form, two grids laid side by side, of the/'generall outline when assembled, of the interior cavity 3 of the iron, as'clearly shown in Fig. 3. These grids are composed of sheets of mica 5 or other suitable insulating material, the inner adjacent edges of which are preferably straight as shown, the outer edges bein curved at their fro-nt orti'ons to the outline of the interior face o the'side walls, and allot said edges being provided with closely adjacent serrations-or slots 6. These' grids are separably Wound with resistance wires 7, 7, embracing and surrounding the insulating grids 5 throughout their entire length a-s shown, saidA wires being connected at the front end at 8 and together brought back and connected with the central contact button 10. The other terminals ,11 and 12 of the resistance wires of each of the grids are separately connected with similar terminal binding postsy and buttons 13 and 14 respectively, each of said buttons referably having transverse grooves 15 or engagement ofthe movable contact terminal of the switch. For the purpose of identi fication ofy each of saidterminals I have employed the signs minus, plus and minus lfor the several terminals, as indicated. The grids as thus constructed are mounted between a lower plate 16 of sheet metal and an upper plate 17, the low-er plate being bent up around the edges of the upper plate so as to firmly embrace the entire resistance mechanism between the two as clearly shown, while at the outer end the plate 16 is bent upwardly at right angles for the full width of the end opening ofthe sad iron, providing a wall 18. insulation fiis interposed -between the coils 7 and lates 16 and 17. The end of upper plate 1g is bent upwardly' inthe same manner' providing an end ange, 1-9 which is riveted to end plate 18 as indicated at 20, whereby the two plates aie ,firmly connected together and, with the inclosed resistance, constitute a sing-le unit.y i Q A portion of the upwardly turned endf- 18 Aof, the'bottom wall is cut out to provide' a are a plurality ot` slides 28 shelf 21 which is bent backwardly at right angles as shown, for a width suiclent'to provide a mounting for the contact termi` nals 13, 10 and 14 with which the terminals of the'resistanee wires are connected as has been stated, and these terminal contacts are provided with suitable insulation as clearly shown and iiXedly mounted 1n the supporting shelf 21.

23 is a containing box or case of light sheet metal secured upon the upwardly turned tiange of wall 18 by screws 24, said case being of sucient width and height to embrace the Contact mechanism and to provide for the mounting upon its top por` tion the main conductor 25. Said conductor constitutes the current supply and is of any suitable construction, preferably having an outer wrapping kor insulating tube and mounted with a stiiiening armor for convenience, as will be readily understood.

Mounted in bearing slots 26 and 27 in the end wall 18 -and shell 23 respectively corresponding with the stationary contact terminals, each or" said slides, in one form of the device.

being provided with Ya binding screw 29 to which one of the terminals of the conductor wire is att-ached, and having a contacting terminal lip 30 1n electrical connec- -tiontherewith and mounted by suitable insulation 31 in the slide 28.

' 32 is a shifting lever pivoted in case 23 at 34 and engaging by its terminal 35 in a holey l12 in the front portion of plate 28, which is also preferably provided with a' transverse ridge 36. By means of the lever 32 it will be seen that either plate 28 and its contact terminal may be shifted into or out of electrical engagement with its companion terminal button 13, 10 or 1st-so as to make or break the current therethrough and to establish the circuit through the resistance grids. By shifting one or more of the levers 32, it will be seen that the currents can be so distributed through the resistance as to vary the same. Thus, by combining the two minus terminals, throwing the current around both grids in series, will give a resistance of 72 ohms. By establishing the circuit through the wires of either grid singly as minus and plus, or plus and minus, a resistance of 36 ohms is produced. By establishing the circuit in parallel by throwing in all three contacts minus, plus and minus, a resistance of 18 ohms'is secured. By connecting terminals 13 and 14 to the supply line, the terminal 10 serving to connect the two coils, the grids may be connected in series.`

By reason of the compact construction of the resistance unit comprised between the plates 16 and 17 and incorporated with the terminal and switch-mechanism and the casing 23 it will be seen that it can be entirely removed from the sad iron or re another resistance unit. For suc pur ose the end wall 18 is merely screwed to the ugs 1 by means of securing screws 37, and a particular advantage of this construction 1s that the sad iron is thus capable of use with resistances of any desired capacity dependent upon the local conditions, as current voltage, or the different uses to which the sad iron 1s to be put with currents of the same voltage. In other words, its construction enables of very considerable latitude accm lished by the different possible windings o the grids for diterent voltages; plurality of the grids; the combination with them of the double set of windings, and the plurality of contact mechanism. An additional feature of the device which is of value and im )ortance is the facility with which its weig t may be varied. This is accomplished by means of weights 38 which, like the grids, are preferable of the outline of the interior cavity 3 of the sad iron, but of different thicknesses.

In Fig. 2 one such weight is shown of medium size, which is laid upon the top of the resistance unit and introduced into the sad iron, and then secured in lace, as is also the grid, with considerab e firmness, by the means of securing screws 39 preferably one at each side of the middle portion centrally of the iron as shown. Each weight 38 is provided with a deeply recessed cavity 40 into the bottom of which screw 39 is inserted, the depth of said cavity varying with weights of ditierent thicknesses, so that the bottom of each cavity shall be a uniform distance above the llower surface of the weight.v B this means, each weight of different sizewi l receive the securing down to their full limit of travel, so that their heads have a proper bearing and do not project unnecessarily upward from the top surface of the iron.

In Fig. 7 I have shown a construction in which a double contact plate 28 is provided for establishing a circuit throu h bothgrids in series, having contact mem ers at each side for the terminal connections 13 and 14 which will now be minus and plus and corresponding binding posts 29, said plate being slidingly mounted in the case 23 and operable by the terminal lever 32 engaging hole 42', as will be readily understood. In such construction the mi dle connection 10 is not used, the grid being wound to give a resistance of 18 ohms. Byl this means the laced by double contacts may be effected by the use ofa singleflever. It will be understood that posts 29 are provided with insulation in the same manner as binding posts 29. The iron is provided with the usual handle 4l of any suitable construction and the general design or proportions of the iron may be varied to suit the use to which it is to be put.

screws when screwed The advaI 1 t-ages of-the invention will readily appreciated by all those familiar with this classof utensils, 4and it'will be found to provide for A a wide variety of adaptations as indicated.

Having described my invention, what I claim is l .1. An electric sad iron havinga removable resistance unit provided with attached terminal connectin devices and shifting make- 'and-break switc mechanism for establishing variable currents through the resistance unit.

2. An electric sad iron having a removable resistance unit provided with a pluralit of currentiterminal contacts, and terminaly ata t-aching devices and switch mechanism incorporated with and forming a part of the resistance uni-t.

3. An electric sad iron having a removable resistance unit arranged for insertion in the' 'interior of the iron, means for ,securing it therein, and switch'mechanism `for establishing varying currents Athrough the resistance unitincorporated with and forming a part of the resistance unit.

4. An electric sad iron having a removable kresistance unit arranged for insertion in the interior of the iron, a weight superimposed upon the resistance unit having recesses -in its upper portion, and screws engaging said recesses forv securing the weight and unit in position.

. 5. A resistance unit comprising an insulating grid or base provided with edge recesses and a conducting wire wound thereon, inclcsing plates' therefor having switch sulating in Apresence o two witnesses.

with said extensions and forming a portion of said unit. y

7. A resistance unit comprising an insulating grid or base provided with edge recesses and a conducting wire wound thereon,

a lower and upper plate inclosing the grid and irmly associated together and providing an upturned end wall, and terminals and switch vmechanism mounted in said end wall.

8. Afresistancel for anelectric sad iron comprising a single portable unit embodying grids, heat developing resistance wound thereon, insulatiomand a casing therefor; and terminal attaching and switch mechanism incorporated with said parts and form- `60 ing an integral part of the unit.

9. The combination with the hollow sad iron body, of a removable resistance within the sad iron body having attached current supply and switch mechanism, a removable 65. :Wel

ght partially iilling the space within the hollow iron body, and means for securing. the weight within the hollow sad iron body downwardly a ainst the said resistance.

10. The com ination with the hollow sad iron body, of a`removable resistance therein, a removable weight within the hollow` iron superimposed on the resistance'and spaced downwardly from the inner top of Y the -hollow iron body, 'and means incorpo- '75l rated .with thev top of the hollow iron body j for securing the weight in position.

11. The combina-tion with the hollow sad iron body, of a removable resistance therein,

a removable weight Within the hollow iron superimposed on the resistance having a set i screw bearing, and a set screw mounted in, the sadiron engaglng said bear1ng.

In testimon whereof 'I aix my slgnatu-le'-l Witnesses: y v

l C. M. CLARKE, Cms. S. Lamy; 

